foojay.io - Friends Of OpenJDK

• 25 Sep Java Stammtisch

  Java User Group Hannover Pizza Unica, Hannover 19:00

• 28 Sep Explyt Webinar: Working with AI Tools at the User Level 2026

  Webinar Online

• 29 Sep dev connect OWL 2026

  Java User Group Bielefeld Wissenswerkstadt Bielefeld, Bielefeld 14:30

• 29 Sep BrabantJUG @ TOPDesk

  BrabantJUG TOPdesk Nederland BV, Tilburg 17:00

• 30 Sep Amsterdam JUG OTel Workshop at Dash0

  Amsterdam Java User Group Nieuwezijds Voorburgwal 162, Amsterdam 18:00

• 30 Sep Maven/Open Source (Sandra Parsick)

  Java User Group Paderborn adesso SE, Deutschland 18:00

• 30 Sep Embabel, an Agentic AI Framework

  Orlando JUG (Java User Group) Dr. Phillips Academic Commons (UCF Downtown), Orlando 18:30

• 1 Oct October 2026: Snake in 10 Lines and the Identity of AI Agents

  JUG Noord Reviusstraat 2, Leeuwarden 17:00

• 1 Oct Double Feature: Value Objects and Project Valhalla + Java for AI

  Java User Group Karlsruhe SAP Schulungszentrum Walldorf, Walldorf 18:00

• 1 Oct JUG DA: Double Feature: Value Objects and Project Valhalla + Java for AI (Nicolai Parlog, Zoran Sevarac)

  Java User Group Darmstadt Room S3, Walldorf 18:30

• 1 Oct Value Objects and Project Valhalla + Java for AI

  Java User Group Mannheim Room S3, Walldorf 19:00

• 1 Oct LJC Meetup at Engine by Starling

  LJC - London Java Community Engine by Starling, London 18:00

• 5–9 Oct Devoxx Belgium 2026

  Conference Kinepolis Antwerpen, Antwerp

• 5 Oct Amsterdam JUG Meetup at Mollie

  Amsterdam Java User Group Mollie, Amsterdam 18:00

• 5 Oct A Java 8 lambda and JobRunr is all you need for distributed (batch) processing (Ronald Dehuysser)

  Java User Group Frankfurt (Main) Germany 18:30

• 5 Oct Modernizing Java EE Monoliths: A Roadmap to Scalable Microservices

  Java User Group München (JUGM) Eden Hotel Wolff, München 19:00

• 5 Oct LJC Roundtable: The JCP, Java Community & The Future of Java

  LJC - London Java Community The Marquis Cornwallis, London 18:00

• 5 Oct Building Intelligent Java Apps: Agent Patterns, MCP, and the Future of AI Native

  Toronto Java Users Group 16 York St, Toronto 18:30

• 6 Oct Monatlicher Stammtisch der JUG Berlin-Brandenburg

  Java Usergroup Berlin-Brandenburg Da Vinci, Berlin 18:30

• 6 Oct Consultas en milisegundos sobre tu data lake (sin copiar los datos)

  MadridJUG Zooplus, Madrid 19:00

• 7 Oct JUGO - TBD - save the date

  JUG Oberpfalz Online 18:00

• 7 Oct A Java 8 lambda and JobRunr is all you need for distributed (batch) processing!

  Java Usergroup Berlin-Brandenburg codecentric AG, Berlin 18:30

• 8 Oct JobRunr (Ronald Dehuysser)

  Java User Group Paderborn adesso SE, Deutschland 18:00

• 8 Oct AI-Driven Development Meets Jakarta EE: Why Standards Matter More Than Ever

  Java User Group Stuttgart Optica Abrechnungszentrum Dr. Güldener GmbH, Stuttgart 18:30

• 8 Oct Agentic AI Workflows with Embabel

  St. Louis Java User's Group USA 18:30

1. Install Java

   One-time setup to get Java on your machine: check whether you already have it, then install it on Windows, macOS or Linux.

   • Check your Java installation
   • Find Another Java Version
   • Install Java on Linux
   • Install Java on MacOS
   • Install Java on Windows

2. Quick Start Tutorial

   Java Quick Start Tutorial: A high-speed introduction to Java in single source files: no project, no build tool, just java HelloWorld.java and go.

   Under 29 minutes in total

   1. Choosing an Editor
   2. Hello World!
   3. Using Arguments and String Arrays
   4. Working with Numbers
   5. If, Then, Else
   6. Enum and Switch
   7. Using Methods
   8. Using Objects
   9. Reading a Text File
   10. Using Streams
   11. What's Next?

Done, or want another voice? 6 more free Java courses and tutorials, picked by the community.